Safety device for electric irons



T. MARTIN. SAFHY DEVICE FOR ELECT RIC IRONS.

'APPLICA'HON FILED MAY13, I920.

Patented Mar. 22, 1921.

7/; arms 1727/? 181? g THOMAS MARTIN, QFVANCOUVER, BRITISH. COLUMBIA, CANADA.

SAFETY DEVICE FOR ELECTRIC IRONS.

Specification of Letters Patent. Patented Mar, 22, 1921.

Application filed ma 13, 1920. Serial NO. 881,118.

To all whom it may concern. 1

Be it known that I, THOMAS MARTIN, a subject of the King of Great Britain, and a resident of the city of Vancouver, in the Province of British Columbia, Canada, have invented certain new and useful Im rovements in Safety Devices for Electric rons, of which the following is a specification. My invention relates to improvements in safety devices for electrically heated irons, and the object of my invention is to provide a simple, means for preventing overheating of an iron should the .same be left unattended for anylength of time with the current still turned on, thus eliminating entirely all danger of fire from this source. A further object is to devise such a means which is removable and replaceable with great convenience and facility. Y

I attain these objects by the construction illustrated in the accompanying drawings in which- Figure -1 is an elevation of an iron fitted with my device.

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is an outside view of the plug.

Fig. 4 is a view of the plug, in part section. g

' Similar figures of reference indicate similar parts throughoutthe several views.

1 indicates a typical electric iron, provided with a heating block 2 to which are connected the wires 3 and 4 of the electrical circuit. The terminal 5 of the wire 4 is broken to provide a gap (3, which gap is bridged by a ti 7, of lead or other material which is fusi le when the temperature reaches the danger point, and this tip isprovided with a reduced shank portion 7 which 1s removably inserted in a bushing 8 nf-fiber or other insulating material placed in the I as at 11. 12 indicates a boss formed on the ll'lSldB'Of the cover 13 of the iron having a threaded bore 14' correspondin to the threaded portion 11 of the plug. lhe outer end of the plug is provided with a screw driver slot 15;

In use the plug is screwed into the bore 14 until the-fusible tip 7 bears on the divided ends of the terminal 5 to bridge the same and complete the electrical circuit. When the iron becomes heated to a temperature liable to set on fire the stand on which it is resting the tip 7 melts, so that the circuit is broken, and thus the danger is automatically prevented. To restore the iron to its effective condition again all that is necessary is to take a screw driver and unscrew the plug, insert a new tip in the fiber bushing bore 9 of a plug 10 threaded at its outer end and replace the plug, from whichit will be seen that the ob ect sought to be attained is efl'ected n the most simple, convenient, and mexpenslve manner.

- What I claim as my invention is:

tact tip provided with a reduced shank por-' tion embedded in the pro said insulating material.

Signed at \-'ancou\"er, B. C., Canada, this 4th day of May, 1920.

THOMAS MARTIN.

ecting portion of 

